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(No Model.) Y' 2 sheets-sheen 2.

G. A. HARTER.

' ELECTRIC LOCK.

No. 416,103'. Patented Nov. 26, 18'891 Zwm/ Mm 'M M QW wie@ UNITED STATES PATENT OFFICE.

GUS'IAV A. HARTER, OE CHICAGO, ILLINOIS, ASSIGNOR TO THE UNDER- WRITERS HATCH DOOR COMPANY, OF SAME PLACE.

ELECTRIC LOCK.

SPECIFICATION forming part of Letters Patent No. 416,103, dated N ovember 2,6, 1889. Application filed December 4, 1888. Serial No. 292,674. (No model.)

To a/ZZ whom, t may concern:

Be it known that I, GUsTAv A. HARTEE, of Chicago, in the State of Illinois, have invented certain new and useful Improvements in Electric Locks and Method of Connecting the Same in Circuit, of which the following is a specification.

My invention relates to improvements in electric locks used for securing or fastening' 1 o doors in elevator-wells, light-shafts, stai rways,

or other openings in buildings in such inanner that the fastening may be releasedby an electrical impulse; and the object is to proyvide in such locks an electrical switch, in x5 combination with mechanism for operating the bolt, the arrangement being such that the sliding of the bolt or detent in t-he operation of unlocking will out the electro-magnet of the lock out of the circuit and form a 2o connection with extended wires arranged to carry the current farther on. In this manner a battery torce just sufficient to operate one lock may be successfully used to operate a great number of locks connected so as to be successively brought within one circuit by the operation of the switch. The switch and operating mechanism may be placed in va rious mechanical relations or arrangements` with reference to the bolt, so that the vibra- 3o tions thereof shall respectively break and restore the connection with the electro-magnet of the lock and respectively connect and disconnect the switch with the extended wire in the manner required. The mechanism and arrangement which at present appear to be best adapted to the purpose are illustrated in the accompanying drawings, in which- Figure l is a front side view of a surfacelock. Fig. 2 is a view of a reversed side en- 4o larged,showing the side that goes against the door. Fig. 3 is a section on line c 0c of Fig. 2,1ooking in the direction of the arrow. Fig. 4 is a vertical section of an elevator-well, showing the lock applied to a door therein. Fig. 5 represents a series of such locks connected in a circuit provided with Thermostats for closing the saine at various points.

A designates the casing or frame of the lock. 5o B is the bolt or detent, which is supported by being passed through an opening in alug or projection a of the casing and an opening in the casing at a', so that it may slide freely back and forth. In the present instance the casing is cutaway at a2, to adapt it to the peculiar form of catch on the door used with it.

' A spring C is placed between thelug aand a pin or projection b on the bolt and arranged so as to press against the piu and draw the contact end D inward. Then the bolt is 6o pressed forward or set, as in locking, a lug or projection b2 thereon engages a lever D, pivoted at d and held against the lug, so as'to counteract the spring and hold the bolt set.

An electro-magnet consisting of a coil E and its core c, connected in the electrical circuit and arranged to actuate anarmature E,V the latter being' pivoted at c', so as to be easily vibrate-d, is employed to operate the lever D. The end e2 of the armature resting against 7c the lever holds it set, and this is displaced by the vitalization of the magnet, so as to trip the lever and allow the bolt to slide in under the force of the spring C.

To prevent the accidental displacement, as 7.5 by a slight jar in the building or concussion of air, a spring' s, or an ordinary dash-pot s', or both, may be employed to hold the end e2 of the armature normally in position to engage the lever D against any slight impulse 8o other than that of the electro-magnet tending to displace it.`

The casing of the lock is made of metal or other conductive material, so as to form part of the circuit-way.` It is provided with two insulated points E and F', the first of which, through a metal projection f, is in electrical contact with the bolt when extended, as seen in Fig. 3, but not when withdrawn, and the second of which F', through a metal spring 9o f', is in like contact when the bolt is withdra-wn, as represented in the dotted lines, Figs. 2 and 3, showing the lower position of the bolt, in which position the projection f has passed out ot' connection with the point 95 F and has forced the spring f into contact with point F. The circuit-wires G connect with the electro-magnet through an insulated post F2, and through said magnet with the point F on one side and with the lock-casing roo at f2 or anywhere on the other side.

Referring to Fig. 5, which shows a series ot' rbe seen that the closing of the circuit by either of the thermostats would first form a short circuit over the wires G g g g2 through the lowermost lock, which would vitalize the electro-magnet thereof and'trip the lever D. By this the bolt would be sprung down and the connection broken at F and closed on the point F in said bolt. The breaking of the circuit at F and closing it at F of this lock would cut out the wire g and include g3, to form a more extended circuit over the wires G g g2 g3, including the second lock, 'which would receive the full force of the battery and be unlocked like the iirst, and this last operation would cut out the wire g2 and bring in g4, extending,` the circuit to the third lock. In this manner the battery-power might be thrown successively to each of an indeiinite number of such locks so connected in circuit. The setting of the locks restores the connection at F and breaks it at F. The setting of the lock is done by hand when locking the door to which the lock is attached. The projection b rides on the edge of lthe lever D as the bolt is sprung down when the lever is released, Vand the lower end of the lever rides back on the armature, as shown in dotted lines, Fig. 2. The bolt is set by merely pushingit against the spring by the lower projecting end. This movement causes the projection h2 to strike a corresponding projection on said lever at the top and swings the other end of same by the end e2 of the armature, which is weight or spring pressed, so as to come behind the-other part and hold it against the projection of the bolt.

Having thus described my invention, what I claim,and desire to secure by Letters Patent, 1s

l. In an electric lock, the combination, with an electro-magnet, of a'bolt or detent under stress and an electrical switch, said switch being adapted, to break an electrical connection with the electro-magnet and close the same with another circuit adapted to eX- tend the said circuit by the operation of the bolt, substantially as specied.

2. In an electric lock, the combination, with an electric switch, of a sliding springpressed bolt, an electromagnet, and a separate insulated point distinct from said electro-magnet for connecting a separate wire adapted to extend the electric circuit beyond said lock, said switch being connected with said bolt, substantially as shown and described, so that the vibrations thereof will operate said switch and alternately connect and disconnect the same with the coil of the electro-magnet and with said other insulated point, as speciied.

3. In an electric lock, the combination, with an electric switch, of aspring-bolt under stress, a lever, and armature mechanism, substantially shown and described, for holding and releasing said bolt, and au electro-magnet for operating said armature mechanism, said switch being connected with said bolt and' the coil of the electro-magnet, substantially as shown and described, so that the vibration of the bolt in the direction required to unlock it will also throw the switch and sever the electrical connection with the electromagnet, substantially as specified.

4. The combination, with an electric lock having a vibrating bolt under stress and connected with an electrical switch, so as to vibrate the same, and an electro-magnet in connection with mechanism, substantially as shown, for holding and releasing said bolt, of a battery and one set of wires arranged, substantially as shown, with relation to said switch so as to form a short circuit over the coil of said electro-magnet when the switch is thrown in one direction, and another set of wires employed in connection with part of the first set and arranged, substantially as shown, with relation to said switch so as to cut out said electro-magnet and form a long circuit extending beyond said lock when said switch is thrown in the other direction, substantially as specified.

GUSTAV A. HARTER.

Witnesses:

JNO. W. HEPBURN,

' GEO. XV. WARVELLE. 

